When we stayed we were in the farthest building past security. I'm not sure if they are in all buildings.
Ours was one with a roll-in shower but water got everywhere. Ours was set up that once you entered the sink was on your left, the shower was straight ahead in the corner and the toilet was across from the sink. The shower had 2 shower curtains that had to come together and just didn't work well.
See this map of VB: www.wdwmagic.com/other/maps/gallery/26sep2011-disney%27s-vero-beach-resort-map.htm. The studios, 1BRs and 2BRs are in Villa Buildings 12, 14 and 15 on the map, with 12 being the farthest from the pool and 14 the closest. None are really a huge distance to the pool because VB is not really very long from one end to the other.